SGDGCA-2.000MHZ [MICROSEMI]

CMOS/TTL Output Clock Oscillator, 2MHz Nom, ROHS COMPLIANT, HERMETIC SEALED, CERAMIC, SMD, 6 PIN;


型号：	SGDGCA-2.000MHZ
厂家：	Microsemi
描述：	CMOS/TTL Output Clock Oscillator, 2MHz Nom, ROHS COMPLIANT, HERMETIC SEALED, CERAMIC, SMD, 6 PIN
文件：	总6页 (文件大小：142K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

S-Type

Voltage Controlled Crystal Oscillator

Features

• Output Frequencies to 65.536MHz

• 5 or 3.3 Vdc operation

• Tri-State Output

• Low jitter < 6pS rms (for freq >12MHz)

• VCXO with CMOS outputs

• 0/70 or –40/85 °C temperature range

• Hermetically sealed ceramic SMD package

The S-Type Voltage Controlled Crystal

Oscillator

Product is free of lead and compliant to EC RoHS

Directive

Output

Buffer /

Tri State

Applications

• SONET/SDH

• xDSL

• Digital Video

• Low jitter PLL’s

ESD Diodes

Description

f_O

The VI S-Type Voltage Controlled Crystal

Oscillator (VCXO) is a quartz stabilized square

wave generator with a CMOS output and is

tested at CMOS (3.3 and 5V operation) and TTL

(5 V operation) logic levels. Devices are tested

for absolute pull range (APR) and start-up over

the operating temperature range which insures

the performance and reliability.

Input

Buffer

Block Diagram

Figure 1

Vectron International 267 Lowell Rd, Hudson NH 03051

Tel:1-88-VECTRON-1

e-mail: vectron@vectron.com

S-Type Voltage Controlled Crystal Oscillator

Performance Characteristics

Table 1. Electrical Performance

Parameter

Symbo

Min

Typical

Maximum

Units

Supply Voltage ¹(+5 or +3.3 V)

Supply Current

V_DD

I_DD

0.9*V_DD

1.1*V_DD

10mA +0.25mA/MHz

Output Logic Levels

Output Logic High²

V_OH

V_OL

0.8*V_DD

Output Logic Low²

0.1V_DD

Transition Times

Rise Time²

t_R

t_F

Fall Time²

Symmetry or Duty Cycle³

Nominal Output Frequency Options

Test Conditions for APR (+5V option)

Test Conditions for APR (+3.3V option)

Absolute Pull Range (ordering option)

Gain Transfer

SYM

f_O

V_C

APR

45/55

65.536

4.5

MHz

ppm

1.024

0.5

0.3

3.0

50,80 or 100

Positive

Operating temperature (ordering option)

0/70 or –40/85

°C

Control Voltage Leakage Current

Control Voltage Bandwidth (-3dB)

I_VCXO

KHz

±1

1. A 0.01uF capacitor should be located as close to the supply as possible (to ground) and a 0.1uF is also recommended.

2. Figure 1 defines these parameters. Figure 2 illustrates the equivalent five gate TTL load and operating conditions under which

these parameters are tested and specified.

3. Symmetry is defined as (ON TIME/PERIOD with Vs=-1.4 V for TTL and Vs=2.5 V for CMOS, 5 volt operation, and Vs=1.65V for

3.3 Volt operation. TTL/CMOS pin should be grounded for frequencies <12MHz.

T_F

T_R

I_DD

650Ω

80%

50%

20%

V_DD

.01µF

.1µF

I_C

V_C

On Time

15pF

1.8k

Period

Figure 2. Output Waveform

Figure 3. Output Test Conditions (25±5°C)

Absolute Maximum Ratings

Stresses in excess of the absolute maximum ratings can permanently damage the device. Functional

operation is not implied at these or any other conditions in excess of conditions represented in the

operational sections of this data sheet. Exposure to absolute maximum ratings for extended periods may

adversely affect device reliability.

Table 2. Absolute Maximum Ratings

Parameter

Power Supply

Storage Temperature

Voltage Control Range

Symbol

V_DD

Tstorage

V_C

Ratings

-55/125

0 to V_DD

Unit

Vdc

°C

Vectron International 267 Lowell Rd, Hudson NH 03051

Tel:1-88-VECTRON-1

e-mail: vectron@vectron.com

S-Type Voltage Controlled Crystal Oscillator

Qualification Conformance

The S-Type has undergone the following Mil-Std qualification.

Table 3. Environmental Compliance

Parameter

Conditions

Mechanical Shock

Mechanical Vibration

Solderability

MIL-STD-883C 2002.3, TEST B

MIL-STD-883C 2007.1, TEST C

MIL-STD-883C 2003.5

Gross and Fine Leak

Resistance to Solvents

MIL-STD-883C 1014.7, 100% Tested

MIL-STD-883C 2016

Handling Precautions

Although ESD protection circuitrry has been designed into the the S-Type, proper precautions should be

taken when handling and mounting. VI employs a human body model and a charged-device model (CDM)

for ESD susceptibility testing and design protection evaluation. ESD thresholds are dependent on the

circuit parameters used to define the model. Although no industry wide standard has been adopted for the

CDM, a standard HBM of resistance=1.5Kohms and capacitance = 100pF is widely used and Therefore

can be used for comparison purposes.

Table 4. ESD Ratings

Model

Human Body Model

Charged Device Model

Minimum

1500 V (Mil-STD-883D, Method 3015, Class 1)

1500 V

Absolute Pull Range (APR) Specification

The frequency deviation of the S-Type VCXO is specified in terms of Absolute Pull Range (APR). APR

provides the user with a guaranteed specification for minimum available frequency deviation over all

operating conditions. Operating conditions include operating temperature range, power supply variation,

differences in output loading and changes due to aging.

An S-Type VCXO with an APR of +/-50 ppm will track a +/-50 ppm reference source over all

operating conditions. The same device will typically demonstrate a Total Pull capability of 150 to

350 ppm. Absolute Pull Range (APR) is specified by the fourth character of the product code in Table 6.

Please see Vectron’s web site, www.vectron.com, for the APR Application Note.

Oscillator Aging

Quartz stabilized oscillators typically exhibit a small shift in output frequency during aging. The major

factors which lead to this shift are changes in the mechanical stress on the crystal and mass-loading of

foreign material on the crystal.

As the oscillator ages, relaxation of the crystal mounting stress or transfer of environmental stress

through the package to the crystal mounting arrangement can lead to frequency variations. VI has

minimized these two effects through the use of a miniature AT-Cut strip resonator crystal which allows a

superior mounting arrangement and results in minimal relaxation and almost negligible environmental

stress transfer.

Vectron International 267 Lowell Rd, Hudson NH 03051

Tel:1-88-VECTRON-1

e-mail: vectron@vectron.com

S-Type Voltage Controlled Crystal Oscillator

Oscillator Aging

Mass-loading on the crystal generally results in a frequency decrease and is typically due to out-gassing

of material within a hermetic package or from contamination by external material in a less than hermetic

package. VI has minimized the impact of mass loading by ensuring hermetic integrity and minimizing out-

gassing by limiting the number of internal components through the use of ASIC technology.

Under normal operating conditions with an operating temperature of 40°C, the S-Type will typically exhibit

2 ppm aging in the first year of operation. The device will then typically exhibit 1 ppm aging the following

year with a logarithmic decline each year thereafter.

t _L

260

R _UP

t _P

217

200

R _DN

150

t _S

t _AMB-P

Time (sec)

Figure 4. Suggested IR profile

Figure 5. Tape and Reel

Vectron International 267 Lowell Rd, Hudson NH 03051

Tel:1-88-VECTRON-1

e-mail: vectron@vectron.com

S-Type Voltage Controlled Crystal Oscillator

Figure 6. Outline Diagram

Vectron International 267 Lowell Rd, Hudson NH 03051

Tel:1-88-VECTRON-1

e-mail: vectron@vectron.com

S-Type Voltage Controlled Crystal Oscillator

Table 5. Pin Function

Symbol

V_C

Function

VCXO Control Voltage

Tri-State

TTL Low to Disable Output.

TTL High, or no connect, to Enable Output.

GND

Output

TTL/CMOS

Case Ground

VCXO Output

TTL Logic Low for CMOS optimized symmetry.

TTL Logic High, or no connect, for TTL optimized symmetry.

V_DD

Power Supply Voltage (3.3 V ±10% or 5.0 V ±10%)

Ordering information

Table 6. Standard Frequencies

1.024

4.434

1.544

5.000

2.000

5.760

2.048

6.144

3.088

6.176

3.580

6.312

3.686

6.400

4.000

8.000

4.032

8.192

4.096

8.448

9.192

10.000

14.318

20.000

35.328

11.000

15.360

20.480

38.880

11.2896

15.440

24.000

40.000

11.290

16.000

24.576

40.960

12.000

16.123

24.704

44.736

12.288

16.384

27.000

50.000

12.352

17.734

30.000

51.840

12.900

18.432

32.000

52.000

13.000

19.440

32.768

13.500

19.985

34.368

Other frequencies may be available upon request

Table 7. Part number ordering information

S G U G L A - 44.736 (frequency in MHz)

Package Size

Symmetry

S-Type

A: 45/55%

Supply Voltage

T: Thru hole

Temperature Range

C: 0 to 70°C

G: Gull Wing

L: -40 to 85 °C

E: 0 to 85 °C

Output, Symmetry

Absolute Pull Range (Stability XO)

U: VCXO, +5V, standard linearity

L: VCXO, +5V, 10% linearity

M: VCXO, +5V, ±20 ppm temperature stability

D: VCXO, +3.3V, standard linearity

K: VCXO, +3.3V, 10% linearity

F: XO, +5V

G: ±50 ppm

N: ±80 ppm

H: ±100 ppm

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For Additional Information, Please Contact:

1-888-FAX-VECTRON

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Vectron International reserves the right to make changes to the product(s) and/or information contained herein without notice. No liability is assumed

as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information.

SType.DOC (REVISION DATE: 10/15/10)

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